Sego is a ghost town in Grand County, Utah, United States. It lies in the narrow, winding Sego Canyon, in the Book Cliffs some 5 miles (8.0 km) north of Thompson Springs. Formerly an important eastern Utah coal mining town, Sego was inhabited about 1910–1955. The town is accessed via the grade of the Ballard & Thompson Railroad, a spur from the Denver and Rio Grande Western built by the founders of the town to transport the coal.